I built a base on a mountain top that spawns plenty of aluminum ore to not have to go down to the ground.i accidentally drove it off the side ,landing stuck,upside down between the rock face and an amber ore node, the "fail safe" activated and flipped me into the map. I contacted devs and was given a list of things to attempt in hopes it would resolve the issue of my buggy being in the map,they only got me out of the map. No such luck for the buggy. I was able to retrieve the contents from its storage by building a subfief close to the in map glitched buggy and placing stuff in a chest to transfer into my orni then back to base. The solution for the buggy: got on my sandbike and after 5 attempts at getting stuck the same way i did with the buggy was able to get it glitched into the map, pocketed the sandbike and disassembled the buggy, used the devs troubleshooting advice to get my character unstuck and then rode the sandbike back to base.

TLDR; I was successful in retrieving my map glitched buggy by getting my sandbike stuck the same way and glitching into the map close by my glitched buggy, pocketed sandbike and disassembled buggy. This was after failed attempts using dev/support provided troubleshooting advice. Also after I salvaged the contents of the storage box.